The latest articles on DEV Community by oneirozzzz7 (@oneirozzzz7). https://dev.to/oneirozzzz7 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3990621%2F6c7edfd0-cd3e-4a50-9489-d3d615a9e3ac.jpg https://dev.to/oneirozzzz7 en oneirozzzz7 Thu, 18 Jun 2026 10:00:32 +0000 https://dev.to/oneirozzzz7/17-free-browser-based-tools-for-llm-api-developers-2bhl https://dev.to/oneirozzzz7/17-free-browser-based-tools-for-llm-api-developers-2bhl <p>I kept switching between 5+ different sites just to count tokens, estimate API costs, plan context windows, and format JSON. So I built DevKit AI — a free collection of 17 tools specifically for LLM API workflows.</p> <p><strong>Link:</strong> <a href="https://devkit-ai.com" rel="noopener noreferrer">https://devkit-ai.com</a></p> <h2> Key tools </h2> <ul> <li> <strong>Token Counter</strong> — supports 60+ models (GPT-4, Claude, Gemini, Llama)</li> <li> <strong>LLM Pricing Calculator</strong> — 64 model families, daily-synced pricing, benchmark scores</li> <li> <strong>Context Window Planner</strong> — visualize token budget allocation</li> <li> <strong>JSON Suite</strong> — formatter, diff, JSON-to-TypeScript, JSONPath, schema validator</li> </ul> <h2> Technical decisions </h2> <ul> <li>All computation is client-side (Web Workers + WASM) — zero data transmission</li> <li>Next.js 15 on Vercel</li> <li>Pricing data synced daily from official sources</li> <li>No auth, no accounts, no tracking</li> </ul> <p>Everything runs in your browser. Free, no signup, available in 8 languages.</p> <p>Curious to hear what tools you wish existed for your LLM workflow!</p> ai llm productivity agents